Head to head
Which one will break you first?
Two fingerprints on one grid. Both are scored through your profile, so this answers the question for you rather than for the average player.
Age of Empires II: Definitive Edition is the harder of the two for you, by 1.1 points. The gap is widest on strategy, where Age of Empires II: Definitive Edition asks considerably more than Mortal Kombat 1. If you want the gentler run, start with Mortal Kombat 1.
Axis by axis, biggest gap first
MORTAL KOMBAT 1
Individually the easiest execution in the genre and the most reading: strings are simple, but every one of them is a decision about whether the assist you also picked is available.
Real resistance. Expect to work for it.
AGE OF EMPIRES II: DEFINITIVE EDITION
Build orders are the curve, and the campaigns teach almost none of what the game actually asks for. The hard AI does not forget its economy while it fights.
Sustained pressure. Progress is earned.